This vivid snapshot captures light radiating outward as charged particles zip through in the galaxy's magnetic fields. The low-energy light waves also reveal the presence of a ring of dust that cordons off a third of the sky.

The associated paper is titled "Planck 2015 results. XXV. Diffuse low-frequency Galactic foregrounds", and is still not published in A&A (per ADS), despite having been submitted almost ten months' ago now. Link to the arXiv abstract.